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Resistor

A technology of resistors and resistance alloys, applied in the direction of resistors, trimmer resistors, resistor parts, etc., can solve problems such as difficulty in roughening

Inactive Publication Date: 2006-05-17
FUJI ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the contrary, the copper-nickel alloy whose temperature coefficient of resistance is constant at a low value in a wide temperature range is basically difficult to be oxidized, so it is difficult to roughen it like copper-manganese alloy or copper-manganese-nickel alloy

Method used

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Embodiment approach 1

[0034] The above roughening process was carried out to roughen the surface of a copper-nickel alloy plate containing 54.5% by weight of copper, 43.7% by weight of nickel and 1.8% by weight of manganese and having a thickness of 0.2 mm. Figure 3 to Figure 8 The SEM photographs (diameter magnification 2,000) show the results of the roughening process in various methods.

[0035] image 3 is an SEM photograph of an untreated copper-nickel alloy plate. The copper-nickel alloy plate is rolled to have a smooth surface.

[0036] Figure 4 is a SEM photo of the surface of Sample 1 mechanically polished with #320 nonwoven fabric. The surface, although slightly textured, was not roughened.

[0037] Figure 5 is an SEM photograph of the surface of Sample 2 electropolished using chromic acid. Like Sample 1, the surface of the copper-nickel alloy plate was not roughened.

[0038] Figure 6 is an SEM photograph of the surface of Sample 3 roughened by a nitrous acid etchant. Forms ...

Embodiment approach 2

[0046] For the laminated board produced in Embodiment 1, the thickness of the insulating resin layer was changed, and the breakdown voltage thereof was measured. Table 2 lists the measurement results. It can be seen from Table 2 that when the thickness of the insulating resin layer 3 is 50 microns or more, the dielectric strength (breakdown voltage) required for the resistor can be achieved.

[0047] Thickness (micron)

[0048] According to the present invention, using a resistance alloy plate made of a copper-nickel alloy, such a resistor can be used in a power conversion device such as an inverter. The invention also manufactures a resistor for detecting current with high precision, the resistance of which will not change obviously with the change of temperature. Also, roughening the surface of the copper-nickel alloy by an organic acid etchant can improve the bonding strength between it and the insulating resin layer containing a large amount of inorganic filler....

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Abstract

Provides a high precision current sensing resistor whose resistance does not change significantly with temperature. In this type of resistor, a resistance alloy plate and a heat-dissipating metal plate are laminated with a resin insulating layer. The resistance alloy plate is formed of an alloy containing nickel and copper. After etching the grain boundaries of the alloy into a concave shape, the resistance alloy plate is adhered to the resin. on the insulating layer.

Description

technical field [0001] The present invention relates to current sensing resistors used in power conversion equipment such as inverters. Background technique [0002] In power conversion equipment such as inverters or power components on which IGBT devices are installed, high-precision resistance of about 0.1-100mΩ is provided to accurately detect large currents from several A to 400A. Since resistors generate large amounts of energy due to high currents, power conversion equipment must be able to dissipate heat. As a means of heat dissipation, the structure of the resistor used is to laminate the resistance alloy plate 2 and the heat dissipation metal plate 4 through the resin insulating layer 3, such as figure 1 shown. Such a resistor is a stacked three-layer structure disclosed in Japanese Patent No. 3-16799 and Japanese Patent Laid-Open Publication No. 10-149901. [0003] Copper-manganese alloys, copper-manganese-nickel alloys, or copper-nickel alloys with high resisti...

Claims

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Application Information

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IPC IPC(8): H01C7/06H01C1/01H01C1/08H01C1/084H01C3/00H01C17/06H01C17/24H05B3/12
CPCH01C7/06H01C17/06H01C17/2416H01L2924/0002H05B3/12H01L2924/00
Inventor 冈本健次今村一彦
Owner FUJI ELECTRIC CO LTD
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